Don’t say “the demon span her head around.” The past tense of “spin” in this sense is spun.
The new edition of Common Errors in English Usage is now shipping,
and it makes a great gift. When you order 5–9 copies and use the coupon
code FIFTEEN, you pay only $13.48 each. Order 10 or more for just
$12.15 each. All with free shipping in the US.